Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb83f6284e674ee…

MALICIOUS

PDF

68.7 KB Created: 2021-09-21 12:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ab3d1d7b879c8b9466d260a51d00bc50 SHA-1: ae1334ebe8f1eca8e0f932f34740813114b57435 SHA-256: bdb83f6284e674eeefe0687e948893db436b61a559fb64c1b07d8be3affbfea2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=bliss+android+emulator+download+for+pc PDF link annotation
    • https://xulynuocphangiathinh.vn/images/pic/file/2031532255.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///73263371779.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/99665226947.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pugetajonofefafuzupuz.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/sowazegamofajewodanum.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/14635835883.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495172d729b---tesevugijusof.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jajigikigexuzomok.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f7d645e807f0fb5303e0fc1d32faf66b/35976769320.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/fokujujepudazotad.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/nasonoxuzelukezirexojub.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/31846171432.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vebojanetositu.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/66891891982.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/kuzawolosib.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/lanawidanasegisutefet.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/sadadekasa.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/68812360779.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14533681986131f3b54e2ef.pdfIn PDF document text
    • https://unaizahic.com/Files/files/lejerugonadolozokikumem.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/tusuxewo.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/kifavebaderu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03E 11020 bytes
SHA-256: 9585ec67c1416f8daf8f018a705ae1893894c8923854870095f85a809b53f6c1
font_01_sfnt_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 14060 bytes
SHA-256: a07da90be5214bed8af987c13abd87f3c836d0c88942f7601a033369c291550b
font_02_sfnt_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1